Update Adaptation pathways graph based on the selected actors

[codexpotech]

Currently, the graph shows all actor's data. Need to show only the user-selected actor's data.

cc: @Hydroinformatics

[Hydroinformatics]

Meeting notes from 02/04/2021:

1. All actors should start at business as usual. For example, in above graph actors would start at business as usual in the year 2000, before they all jump to different actions in 2001.
2. When one actor's path is selected, other lines should be grayed out.
3. In the year, when actors transition to a different action, use dotted line to show transitions when lines are jumping up and down. Other option is to use open markers when transition to a next action begins. A legend will be needed to explain the markers (Actions), lines (Pathways), and transitions.
4. To make pathways have large zoom, either:
   a) Make the graph scrollable, so that when actions are 20 or a lot more, then we can still see pathways with same level of zoom. Also, make sure that X axis containing years is outside the scrollable pane so that the years are always visible, OR
   b) Put a maximize button next to pathways graph. SO when the user presses the maximize button, a shadow box with maximized graph and scrollable pane appears.